How to broadcast video - To broadcast video to other users you will need a web camera. At the bottom left you will see the buttons show, start cap and options.  Click on the options button next to start cap. A camera configuration dialogue window will pop up.  Chose "set camera" and use the pull-down menu to select your appropriate camera.  To let other users view your camera, chose "start cap" so it will broadcast to them.  To fine tune or tweak your camera, in options, click on Video Capture pin, in the white large window.  You will see an area that says output size.  Output size is how large and quality of a graphic you will be broadcasting. 480X600 gives me a very good picture, or you can even go larger.  The only limitations are your cameras software itself.  To stop broadcasting video to other users, simply chose "stop cap".  To shut off your camera, you can go back into options and chose close camera. adjusting this is not necessary for all cameras, it's only if you have pixelated or bad camera quality to others.  You can also adjust camera settings through Video Capture Filter (color, etc). 

NOTE:  To help avoid lag, I recommend not using the highest video settings in video output, if you plan on talking on the mic much.  Also, only have as many windows open as necessary, multiple windows and multi-tasking can also you slow and the room down some.